反转字符串

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344. 反转字符串 (Easy)

编写一个函数,其作用是将输入的字符串反转过来。输入字符串以字符数组 s 的形式给出。

不要给另外的数组分配额外的空间,你必须原地修改输入数组、使用 O(1) 的额外空间解决这一问题。

 

示例 1:

输入:s = ["h","e","l","l","o"]
输出:["o","l","l","e","h"]

示例 2:

输入:s = ["H","a","n","n","a","h"]
输出:["h","a","n","n","a","H"]

 

提示:

  • 1 <= s.length <= 105
  • s[i] 都是 ASCII 码表中的可打印字符

相关话题

[递归] [双指针] [字符串]

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